Improvement in furnaces



NATHAN L. NEwooMB,

PATENT OFFICE.

or CLEVELAND, oHIo.

IMPROVEMENT IN FURNACES.

Specification forming part-of Letters Patent No. 168,174, datedSeptember 28,1875; application filed August 12, 1875.

To all whom it may concern:

Be itl known that I, NATHAN L. NEwooMB, of Cleveland, in the county ofCuyahoga and Stateof Ohio, have invented certain new and usefulImprovements in Furnaces for Steam- Boiler, Sto.; and Ido hereby declarethe fol- Vlowing to be a full, clear, and exact descripdinarytubular-'due boiler; Fig. 2, a cross-sec.l

tion of same; Fig. 3, a longitudinal section of my invention as adaptedto the common return-line boiler.

. My invention consists in the following parts and combinations, ashereinafter specified and claimed, wherein- A is the furnace orlire-box, for instance, of a locomotive, as shown in the drawings, withits crown-sheet A and'tubular ilues A,.grate bars a, and ash-pita. B isafire-wall, constructed, preferably, of masonry, or of any suitablematerial of sufficient strength, and capable of resisting the effect ofheat. From the bottom or lower portion of the re-wall B exf tend theiiues C, of any suitable construction and material. These iiues areprovided with valves C', to regulatev the amount and. force of air.passing through them. These flues may be one or more in number, and aremade to open in a forward direction above the tire-wall B, as showninFigs. l and 3.

It is only necessary to change the fashion without substantiallyaltering the construction, and without at all affecting or changing theprinciple of my invention, in order to adapt it to furnaces or boilersof different yconstruction, my invention consisting, as it does,essentially in the fire-wall B, placed within the furnace, and providedwith one or more lines, C, opening at or near the bottom of the relwallB, extending upward, and opening forward above said firewall.

The operation of my invention is as follows: The air passing to thelower mouth'of the flue C becomes thoroughly heated before it isdischarged at the upper exit thereof. This air, thus heated anddischarged, aifords a supply of oxygen sufficient to assist verymaterially in the combustion of such matter as has not already beenburned upon the grate-bars or within the fire-box before reaching thispoint.

The advantages that I claim for my invention, besides all that can beclaimed for any device affording a more or less perfect and completecombustion, are, first, extreme simplicity; second, durability; third,its easy adaptation to furnaces of almost any construction; fourth, itsautomatic operation; fifth, by my invention an exceedingly smallgrate-surface is required, and likewise a very moderate draft of airbeneath or over the grate-bars,

consequently an immense saving of fuel 'and a diminished liability ofburning. the gratebars.

The door of the chamber is supplied with an upper and a logver series ofdraft-openings. Whenthe fire is started all are opened; but afterwardthe upper series should be closed,

and the vlower series will not only sufficiently assist in the requiredsupply of oxygen, but will also save materially in preventing the fenderof the'furnace-door from beingl burned.

- y In a furnace where no exhaust-draft is employed, as in the case of alocomotive-flue, con-V nection may be made between the lower mouths ofthe dues C and any suitable vent or other contrivance whereby air may bearti- 1. The combination, with afurnace, of one or more flues, G,adapted to receive air from under the, grate, and to discharge it withinthe furnace above the grate-bars, substantially as and for the purposeshown.

2. The combination, with Jthe furnace, of the Intestimony whereof I havesigned my name 'fire-wall B, placed immediately behind the tov thisspecification in thevpresenceI'of-two subgrate-bars, and extending wellup into said scribing Witnesses.

furnace and one or more flues C receiviu g air fron: below, anddischarging tat the up- NATHAN L' NEWCOMB' per portion of said lire-walland over the grate- Witnesses:

bars, substantially as and for the purpose de- FRANCIS TOUMEY,

scribed. H. T. HOWER.

